Preheat oven to 450 degrees. Line baking sheet with foil. wash red peppers and slice in 1/2, removing stem, seeds and ribs.
Set peppers in baking pan.
Cook ground beef or turkey in a large non-stick skillet over medium-high heat. break up while cooking. When turkey is almost completely done, add the sauce and seasoning and stir until mixed thoroughly.
When meat is completely cooked add spinach to meat and stir until combined.
Scoop meat mixture into peppers
Sprinkle with parmesan cheese and bake for 20-30 mins.
Remove from oven and let cool slightly before serving.